golden algae vs algae

golden algae and algae both are nouns.

Word	Noun	Adjective	Verb	Adverb
golden algae	Yes	No	No	No
algae	Yes	No	No	No

As nouns, algae is a hypernym of golden algae; that is, algae is a word with a broader meaning than golden algae:

golden algae: algae having the pigments chlorophyll and carotene and xanthophyll
algae: primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves

Other hypernyms of golden algae include alga.

golden algae (noun)	algae (noun)
algae having the pigments chlorophyll and carotene and xanthophyll	primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves